Stoker.



PATENTED OUT. l5, 1907y C. A. KNOWLTON.

STOKBR.

APPLICATION FILED 121213.11. 1904.

v@ 4 SHEETS-#SHEET l.

WXTNESSES 1 ATTORNEY.

No. 867,979." PATENTED 00T. 15, 1907.

1 o. A'. KNQWLTON.

STOKER.

APPLIGATION FILED FEB. 11. 1901.

\\ 4 SHEETS-SHEET 2` 1x1-Tommi Nb. 867,979. PATNTBD 00T. 15, 1907,

C. A. KNOWLTON. STOKBR.

APPLICATION FILED FEB.11,1904.

4 SHEETSnSHEET 3` ATTORNEY.

No. 867,979, V PATENTED 00T. 15, 1907. o. A. KNOWLTON. STUUR.

PPLIGATION FILED FEB.11. 1904.

4 sums-SHEET 4.

ATE EETcE.

CHARLS A. KNOWLTON, OF ERIE, PENi'bYLVANIA, ASSIGNOR TO THE AMERICANSTOKER COMPANY, Ol ERIE, PENNSYLVANIA, A CORPORATION OF NEW YORK.

STOKER.

Specification of Letters Patent.

Patented Oct. 15, 1907.

To all whom it may concern:

Be it known that I, CHARLES A. KNowL'roN, a citizen of the UnitedStates, residing at Erie, in the county of Erie and State ofPennsylvania, have invented new and useful Improvements in Stokers, of'which the following is a specification. v

This invention relates to stokersand consists in cer4 tain improvementsin`the construction thereof will be hereinafter fully described andpointed out in the claims.

The invention is illustrated in the accompanying drawings as followsFigure l shows auslection on the line 1 1 in Fig. 2. Fig. 2 shows asection on the line 2-2 in Fig. l. Fig. 3, a front elevation of afurnace. Fig. 4, a detached plan view of a grate carriage constructionshowing the rear end of said construction. 1f ig. 5, is a section on theline 5-5 in Fig. 4, the grate bars being removed to better showconstruction. Fig. `G is a perspective View of a grate bar. Fig. 7, aperspective View of a part of the tw yer ca p. Fig. 8, a detailed Viewof the rock lever for operating the grate carriages. Fig. 9, a detailedView of the track for the grate carriage rollers. Fig. l0, a sideelevation of one of the grate carriage rollers. Fig. ll, an endelevation of the same. Fig. 12, a detailed View of one of the sides ofone of the grate carriages. Fig. I3, a detailed view of one of the sidesof the companion grate carriages.

I have shown my invention as adapted to an under feed stoker arranged atthe center of a furnace. A marks the furnace; A ,the bridge wall; A"ethe'ash pit; A"- the front wall; B, a fragment of a boiler mounted overthevfurnace. These are of ordinary construction.

The feed'device to which I have attached my inven- .tion is not'iinitself new. It comprises the feed box C which extends longitudinallyintothe furnace from a point without thesame. Arranged in the box is theconveyor screw C. This screw is mounted on the shaft C. A hopper C3opens into thefeed box C and fuel is delivered to this hopper andcarried by the conveyor screw into the furnace, and forced up over thetop of the box. The screw is operated by an engine of which the cylinderG forms a part, The link g extends from the piston rod (not shown) ofthe` engine. The rock arm g is connected with the link g; lthe pavi'lsy2 are-arranged on the rock arm. '-lhe ratchet wheel g3 is in the pathof the pawls g1. It will readily be seen that as the engine reeiprocatesthe shaft C2 is rotated through the action of the levers g/ and y? uponthe ratchet wheel, thus' driving the screw conveyor and effecting thefeed. l, 'l

This style of stoker band feeding device has been ac tively on themarket for some time. The wind box D is arranged immediately under thevfeed box., and air are provided with l,the roller surfaces h and h The`on the roller. The cross piecc's are in the form of T -afforded thegrate bars may be moved much closer topasses from the wind box into thefurnace through the twyer f in the twyer cap F. Supplemental twyers Eare arranged below the cap. In practice it has been found that with somefuels at least there has been some difficulty with clinkers forming atthe edges Y'of the feed box, and also in carrying away the clinkers andash from the sides of the feed box after it is fed into the furnace. Myinvention is especially adapted to this arrangement of feed mechanism,but is not so limited or infact to a use with any specific mechanism, inas much as the feed may be delivered directly to the grate bars withoutthe intervention of a special feeding device.

The grate bar mechanism is provided with carriages having the sidepieces J and J (see Fig. 5.) These are carried by the rollers l and I.The rollers are mounted on the tracks H. The side pieces J are connectedby the cross pieces jAll and j, and the sidepieces .I are connected bythe cross pieces j The side pieces are provided `with the rollersurfaces j and j', and the tracks H rollers I and l, as clearly shown inFigs. l0 and ll, are adapted to roll on these surfaces, the flanges i ofthe rollers extending each side'of the surface and keeping the rolls inplace on the track and the carriages in place irons and the grate bars Kare simply pla-ced on the uprights'of these cross' pieces, the gratebars having channels k for this purpose. The grate bars are prefer'-ably provided with the shoulder ld, for engaging the fuel and to Ibetteradapt them for feeding the fuel forward. The two carriages arereciprocated in opposi tion, that is they are moved in oppositedirection so that the grate bars carried by one can'iage are moved in anopposite direction from that of the grate bars carriod by the othercarriage, thus breaking up any clinker that may be deposited on thegrate bars in feeding the fuel forward. The grate bars are stepped sothat each grate liar'passes over the next succeeding grate bar below it.W ith the straight line parallel movement thus gether than commonly, andtherefore have a greater efficiency both as to the removing of elinkerlfrom the bars, and also in making a closure between the furnace and theash pit. The roller bearings eliminate friction, and at the same timeforin a bearing which will be efficient even though the parts lbedistorted to considerable extent by heat'.

, In the feeding device here shown some difficulty has been experiencedVin lkeeping the twyer cap free from @linker and from burning out. Iprefer therefore to arrange the twyer cap/on the cross piece j4 sothatit gets the movement. of tiie grate bars, thus clearing it to alarge extent of clinker and relieving it of thediffculty mentioned.Immediately below the twyer cap I provide the stationary bar L overwhich thetwyer cap moves. lt is arranged immediately over the top of theWind box and forms a part oi the twyer system.

I haveprovided a-prcierable mechanism i nrecipro at ing the gratecarriages. It is especially eiiicient in con nection with the screwconveyor' herein described. The

' gear g4 is fixed on the shaft C2. `rThis drives a gear m`f The gear mis fixed on the shalt M. The sha-it M extends through the Wind box tothe retirend of the ash pit Where it is jonrnaled in the box M2. Aneccentric M is fixed on this shaft near the rear end thereof andoperates in' a yoke N. The links n extend from the yoke Nte the rocklevers O. The rock levers O are ixed on the shafts Q and arranged nearthe rcar ends thereof. These shafts are journaled in the boxes O and O4and extend along the sides of the wind box to the front o the furnace.Rock levers O2, similar in construction to the rock levers O arearranged on the irontl ends oi these shafts O. The carriage sides .I andJ are provided with the slots jG and j?. Thepins o extend from the rocklevers into the slots j7 and the pins o extend into the slots joandcommunicatc the movement of the levers to the carriages. It willreadily be seen that as the rock levers are moved through the action ofthe eccentric the carriages aremoved in opposite directions, thuscarrying the grate bars oi one carriage over the grate bars oi" theother carriage. It will also bc noted that the carriages .l :it bothsides of the leed device move in the same direction so that the tvvyerconstruction may be made in one piece. At the side of the furnace Iprovide `the passage P for ashes and cliukcr. In order to'prevent theentrance oi cold air at this point` I make the Wall oi' this passageincylin drical. i'orni and introduce the Winged gate p. This gate ismounted on the shalt P. It will r jadily be seen that While the turnngoithis shalt will carry any dc- 4posit on the wings p through the, passageP il. closes the passage I at all limes to the passage. of air. A leverI is arranged at lhe iront of the furnace lor turning the gate p. 5

W'hile I have shown the mechanism with the removable grate bars I do notwish to be understood to so limit the structure. l

'llie grate bars may. form if desired a part o1' the carriage frame andthe carriage frame sides may il desired be formed integral with thegrate hars.

What I claim as new is:.-

i. In a stolier thel combi-ation of carrying," fuel from a feedingrdevice for without the furnace to )vithin and along' the 'interior ofthe furnace, in a longitudinal directlo. relatively to the furnace;gratos arrnngfed ofthe sides oi tha` leerling device: carriases forsupporting the g'rates;

i rollers for supporting' the carriages laterally wlh respect to thedirection oi' movement ol' the i'nel in the fer-ding device; and meansfor rcciprm-aling tbe r'arrinees.

2. In n stoker the combination oi :i i'ccdne device ior carrying fuelfrom without the furnace 1o within :ind :ilona the interior oi? thefurnace in a lonc'tmlionl lil-omino rolo tively to the furnace; :ratesarranged al thc side.- of' said feed device; carriages for suppintngr.said croi' il1 grate bars beim.r arranged on said carri-lacs in grou;:Inl groups comprising; alternate `crate bars; rollers for snp portingthe carriages; and means l'orrecipiwwalbm the carriages in oppositedirections to morc'ilu :rale lun-s ol' the groups supported thereby inopposite dirol lions.

3. In n Stoker, the combination oi' a feed box a rnneed lo deliver fuelfrom beneath the l'c; n fuel support in tbc form of a twyer cap for saidbox; a grate :irrnnecd al the side of said rwyer cap und adapted locurry tool from sill cap; said grate comprising,r reciprocating4 eranboi-s; :i carriage for supporting said reciprocnlin:` :rate bars:rollers for supportingsaid carriage; and moans- 1`or recio recallingsaid carriage laici-:illy relative to tbc direction oi' feed through thefeed box.

-i. In :1 Stoker. the combination oi' a i'oed box a winged lto deliveri'uel from without the furnace to wirbin and along the interior of thefurnace and from beneath the fire: n fuel support in the form of :itn'lvcr cap i'or ysaid box; u grate comprising Ernte bars arrnnecl ingroup: and adapted to move the fuel latcrnly from said box: :icarrinfl-,e for each group; rollers 'for supporto said carriages; andmeans for reciprocating said cai locos in opposite directions. thegratos beine arranged lo carry linfnel from the iced box Latein-illyacross the inrnacc.

5. in n proker the combination of a feed bo\Y :irrnne'ed to feed fnejifrom beneath (he lire; a i'ncl support in 1bc form of n twyer cap at theside oi" said feed box adapted to -rcceive the fuel from sold box; grate.mrs arranged nl the sides of the twyer cap and adapted to rei-ciro fueltherefrom: a carriaec for snpportiin: said e 'atc bars :ind the tu'yercup; rollers ior supporting. said curi-inno; und

means for reciprocalinf,r said curriuge und with it lhc :nilo bar andtwyer cap.

ti. ln a stoker, the combination willi the g' tc oxo-nd ine; from frontto rear of the sioiier. of cui-rin support ine said crates, a shaftextending` from ibo from or-ibe sioker lo the reni' of the sioser.operating.; incans- :irl-:inccfl on the shaft at the rear of the stonerfor movin"Y carriages. mechanism transmitting.: the movement ol'operatingl menos to the front of the stolier, :1nd means :it the frontof the sroker connecting said mechanism \\illrb carriages'.

7. In a Stoker the `combination with the craie; oi car` riaees for saidgrafo; the rock shaft 0 havin; the roi-lr levi, s O :1nd 0? thereon;connections between said rock levers and sold carriages i'orreciproaclinger snbl carriaucs in opposite directions; :ind in onnsconnecting with the rock lever t) nt the rear of the stoker fornclnntiin." th-v` roch shaft O'.

In testimony whereof l have hereunto set my hond in the presence of twosubscribingY witnesses,

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